Recent Log Entries

COMMENT ON Inj. 1/4 CM - Booster Swap

Log Number: 4153259Logbook(s): Body: 

ITV0I05 - cables disconnected, air solenoid bracket dismounted from girder, cables coiled up and out of the way
ITV0I06 - cables disconnected, air solenoid bracket dismounted from girder, cables coiled up and out of the way
ITV0I06A - cables disconnected, air solenoid bracket dismounted from girder, cables coiled up and out of the way
ITV1D00 - cables disconnected, air solenoid bracket dismounted from girder, cables coiled up and out of the way

FCup1 - cables disconnected, air solenoid bracket dismounted from girder, cables coiled up and out of the way

Aperture 3 - cables disconnected, air

COMMENT ON Plasma processing in CEBAF accelerator

Log Number: 4153253Logbook(s): Body: 

Yes that is the current schedule, which has two weeks of float at the end. (e.g. if something gets delayed up front those dates will be later. Adding 2L23 in would add another week between 2L24 and 2L22.

Here is a link to the OSP.

https://misportal.jlab.org/mis/apps/mis_forms/operational_safety_procedu...

On 2L23 Folks should understand that it went into the machine field emission free at 98 MeV. When I measured it in Feb. that number had dropped to 70 MeV. Had it maintained something close to 98 MeV I would not be asking to do it.

LERF CM LLs lowered

Log Number: 4153245Logbook(s): Entry Makers: thilanBody: 

Lowering FL02 and LCLS CM03 in LERF in prep for utubes on Mon. Will lower FL01 tomorrow

COMMENT ON Plasma processing in CEBAF accelerator

Log Number: 4153241Logbook(s): Body: 

Because 2L23 has not been approved, I'd like to list the processing schedule for confirmation :

2L25 1 May to 5 May
2L24 8 Man to 12 May
2L22 15 May to 19 May

In addition, an OSP will need to accompany this task to ensure that it will be executed with the proper safeguards in place before being approved.

Shutting down CHL1

Log Number: 4153165Logbook(s): Entry Makers: thilanBody: 

Switched SLinac PS and PR to CHL2. Shutting off CHL1 and doing utubes for shutdown

status phase2 injector work Day 3

Log Number: 4153124Logbook(s): Body: 

After Marcy, Phil, Jessica and Tony swapped A2 region viewer and harp, we disconnected the chopper region from the phase2 region beamline. And we disconnected the keV spectrometer beamline. We added blank flanges at a couple locations and pumped the capture region back down, which restored vacuum in the upstream 'warm girder' region of the 1/4 CM.

We also removed some water flow meters, magnets, and assorted odds and ends as part of our dismantling of the 'old' phase2 beamline.

comment on vacuum burp in the injector CMs

Log Number: 4153121Logbook(s): Entry Makers: poelkerBody: 

This morning, we vented the chopper region and through the capture, all the way to valve VBV0I07 which was CLOSED. WE know this valve leaks, we monitored vacuum downstream of this valve with a local gamma supply. All three SRF valves associated with the 1/4 CM were closed. While the chopper/capture region was vented, the ion pump current downstream of leaky valve VBV0I07 went up three orders of magnitude. The space downstream of valve VBV0I07 is called the upstream 'warm girder' region of the 1/4 CM.

COMMENT ON Magnet warm region girder work - SAD 2023

Log Number: 4153063Logbook(s): Body: 

Magnet Measurement:

Status update for SL warm region girders at MQL2L26-MQL2L27.

We have completed all magnet work/disassembly at these two girder locations. The LCW is OFF, and quads are ready to be separated, minus we left one bolt in each quad finger tight (aisle side-please place bolt in bin) just to avoid any incident. The DB/DJ corrector pairs are removed as well. So, Tony can get to the BPM cables and disconnect, and Greg and vacuum group are ready to roll. Adding S/A in case Chris has any work prior to removal.

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